Keyhole-guard.



A. R. REED.

KEYHOLE GUARD.

APPLIOATION rum) MAY 29, 1913.

1,07 3,779. Patented Sept. 23, 1913.

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ALBERT Ross REED, 01 HOT SPRINGS, ARKANSAS.

KEYHOLE GUARD.

To all whom 2'25 may concern:

Be it known that I, ALBERT R. REED, a citizen of the United States, residing at Hot Springs, in the county of Garland and State of Arkansas, have invented a new and useful Keyhole-Guard; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the art of locks, and particularly to a new and useful key hole guard.

Heretofore it has been possible to rotate a key in a look from the exterior, and then push the key from the key hole, thereby permitting a burglar to insert another key from the outside so as to unlock the door.

Therefore an object of the invention is to provide, not only a key hole guard, adapted to cover a portion of a key hole to prevent the removal of the key, but a guard including means to prevent the key from being turned.

In practical fields the details of construction may necessitate alterations, to which the patentee is entitled, provided the alterations fall within the scope of what is claimed.

The invention comprises further features and combination of parts, as hereinafter set forth, shown in the drawings and claimed.

In the drawings :--Figure 1 is a view showing the application of the improved key hole guard, as applied to a portion of a door, showing the guard slide lowered. Fig. 2 is a view similar to Fig. 1 showing the guard slide raised. Fig. 3 is a vertical sectional view on line 33 of Fig. 2. Fig. 41 is a transverse sectional view I on line 14 of Fig. 1. Fig. 5 is a detail.

Referring more especially to the drawings, 1 designates a portion of a door, adapted to be provided with the usual form of look (not shown) and having the usual form of key hole 2, while 3 designates an arched plate secured to the inner face of the door by means of screws or the like 1 The arched portion of the plate 3 is provided with a key hole 4, which is in registration with the key hole 2. G11 the outer face of the plate 3 are guides 5, in which a slidable guard plate 6 is mounted. The flanges of the plate 6 designated by the numeral 7, engage the guides 5 as shown in the transverse sectional view. At the top of the guides a stop bar 8 is provided, to limit the upward movement of the Specification of Letters Patent.

Application filed May 29, 1913.

Patented Sept. 23, 1913.

Serial No. 770,710.

slide plate guard, while extending transversely of the lower edge of the plate 3 is a ledge 9, which likewise constitutes a stop to limit the plate (5 in its downward movement. To support the plate 6 in an upper position, a spring secured at 11 and provided with a lug 12 is carried by the rear or back face of the plate 3, the lug 12 extending through an opening 13 in the arched portion of the plate lVhen the plate (5 is arranged in an upper position, it is supported by the lug 12. A button 1 1 is mounted in an opening 15 of the plate 3. This button is constructed with an annular flange arranged between the free end of the spring and the back face of the plate 3, and is designed to limit the button in its outward movement, that is, when the lug 12 supports the plate 6. When the plate (5 is in a raised position, pressure on button 1 1, acting against the spring 10 will cause the spring to withdraw the lug 12 from the path of the plate 6, thereby permitting the same to fall by gravitation to a lower position, as shown in Fig. 1. However, it will be observed that when the plate is in an upper position and the key in the key hole, the plate (3 will prevent the key from being removed by a burglar from the exterior of the door, owing to the fact that the plate 6 is in the path of the key blank or blade Projecting outwardly from the plate 6 is a shelf or projection 17 having dove-tailed flanges 18, with which the dove-tailed guides 19 of the detent plate 20 engage. 'lhreaded upwardly through the shelf or lug 17 is a thumb screw 21, which is designed to engage the plate 20 to hold the same in adjusted positions. When the plate 20 is adpisted outwardly as shown in Fig. 3, so as to be engaged by the head or hand piece 22 of the key, the key will be prevented from turning. In this manner a burglar cannot rotate the key upon the outside of the door, so as to push the same from the key hole.

The invention having been set forth, what is claimed as new and useful is A key hole guard, comprising an arched plate having a key hole to register with the key hole of a door and provided with guides having upper and lower stops, it slide guard plate arranged in the guide adapted to be limited in its upper movement by the upper stop and in its lower movement by the lower stop, a spring arm secured to the arched plate and having a lug penetrating the arched plate to assume a position in the path of the slide guard plate to support the same name to this specification in the presence of ill; an allpger 1posit 1015 over the keydliple lof two subscribing Witnesses. t e are e ate, an means carrie t -e slide guard plate adapted to prevent g key ALBERT ROSS REED 5 from being rotated from the exterior of a WVitnesses:

door. JOHN A. PALMER, In testimony whereof I have signed my FRANK SPENCER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

